Hadronox Denied

If you have a paladin in your group, have them Judgement of Light the boss, this will heal the adds attacking and give you those few extra seconds before they all die from Leach Poison to take him down.

The tactic we used: we had one rogue aggro the first Crusher and then vanish (causing everything to despawn as mentioned above), after which we went and nuked him down. The most important part was, however, to have 1 person afk reading wowhead comments - that seemed to do the trick!

The way my group did it tonight seemed really easy and it was dumb luck that I found out how to do it. First, face the 2 stairways. On the right it looks like a spike coming up out of the web/ground. You will notice all the mobs coming down the stairs cut close to the corner of this spike to go around.

After you kill the 3rd crusher pack, your tank should move with his left side to this spike, just before the corner of it, facing where Hadronox will come up. A few seconds later you will see him come up with a ton of adds on him. Your tank should move a few steps forward and taunt him off these mobs and move back to his position at the spike with Hadronox facing the path the adds from the stairs will take and shield wall. The rest of the group should move behind Hadronox so as not to get poisoned. The boss should already be at 80% just from the adds destroying him from behind. From this point on, do not do anything to #$%^ these mobs off. Don't AE, dont buff, and try not to heal too much. Just single target dmg him. The mobs coming from the stairs will cut the corner close like you want them to and will almost instantly be poisoned by the boss, which will cause them to aggro on him too. Just attack the boss and he will literally explode in about 10-15 seconds from both your attacks and the adds. He won't have enough time to kill an add himself to regen health. Our group was a shaman/mage/rogue/death knight/warrior.

The only downside to this strat is that after he dies you will have about 30 angry spiders that will destroy your group in seconds.